Silver-coated hollow-glass waveguide for applications at 800 nm

Abstract

A 250-microm-bore size and 50-cm-length hollow-glass waveguide (HGW) coated with a thin film of silver has been used to transport laser pulses at 800 nm from a Ti:sapphire oscillator. The silver film is deposited by a liquid-phase process. The measured transmission of this silver-coated HGW is 95%, which is considerably higher than the transmission of HGWs with no coating, as reported by other groups. The image of the output beam taken at different distances from the fiber output shows that a single HE11 mode couples to free-space modes from the exit of the fiber. Considerable spectral broadening can be obtained with high-intensity femtosecond pulse when this waveguide is filled with argon. This HGW can be used for such applications as beam transport and optical-pulse compression.

Atomic spectroscopy and quantum optics in hollow‐core waveguides

“…Such waveguides have been realized in practice by coating glass tubes (d C $ 250 μm) with silver layers of several hundred nanometers thickness. Optical measurements on 50 cm long air-filled fibers were made and showed an attenuation of 10 3 cm 1 at a wavelength of 800 nm [57]. However, difficulties in developing a suitable coating process for on-chip waveguides and substantially higher experimental loss due to imperfections of the metal coating due to surface roughness [58] have prevented the use of this approach for building functional hollow-core waveguides.…”

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“…The inner wall of glass capillaries has also been coated with metallic layers in order to produce a high reflectivity surface (Mohebbi et al 2002)-see Fig. 2d.…”